Help! 2000 Yamaha 9.9 won't pee while running - SailNet Community

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Old 01-16-2012
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Help! 2000 Yamaha 9.9 won't pee while running

Hey guys...I'm new to outboards. I recently picked up a used 2000 Yamaha 9.9 HT. When I connect the hose to the flush connection I get a nice stream of water out the pee port. When I put the engine in the water for the first time and started her up, nothing came out the port. I checked the intakes on the lower unit and theyre clear and when I run the motor on the hard hooked to the flush I get a solid flow out the lower end exhaust.

I talked with someone at a local retail store and he suggested that the thermostat might be between the pee port and the water pump, so if the thermostat was closed then I wouldn't see a discharge until the block heated up enough to open the thermostat. I read elseware that I should see a steady stream of water at all times. Im at a loss...does anyone have any ideas before I break open the lower end to check out the impeller?

I have a T9.9 EXRY...2000 two-cylinder 9.9 fourstroke, high thrust with remote and electric start.

Thanks,
Matt
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Old 01-16-2012
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No thermostat, bad impeller...
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Old 01-17-2012
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Replace the impeller in the lower unit. This will be a rubber gear shaped thing. it's good practice to replace this every year or two anyway. If the previous owner had run the motor dry (out of the water, for example) for even a minute or two, this will likely totally ruin the impeller.

The good news - pretty inexpensive repair. But do it NOW before running it again.
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Old 01-17-2012
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Try a few simple things first. Try inserting a small wire or toothpick into the pee hole to clear any obstuction. Sometimes a small bug or spider is all it takes to stop the flow. If that doesn't work, remove the thermostat,(easy) and see if you get a flow. If neither works, you'll probably have to remove the lower end, not always easy to separete.
I suspect one of the first 2 remedies should work. I have 2 Yamaha 9.9 high thrust engines.
Marc

Last edited by gershel; 01-17-2012 at 01:17 AM.
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Old 01-17-2012
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I vote impeller... Doesn't hurt to change it anyway. Should be fairly inexpensive for that motor, and easy once you do it. Watch a youtube video or two. Really nothing to it if you're mechanically inclined at all. Wouldn't hurt to check thermostat too.
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Old 01-17-2012
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Replace the impeller and the thermostat both, unless you have maintenance records that show it was done recently. The motor is 12 years old, it's more than due.
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Old 01-17-2012
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That's the direction I was thinking of taking. I picked up an impeller and I'll most likely get to it today. I read a few articles talking about the layout of the coolant passages and from how it sounds I might have a few blocked passageways within the block as well. I'll pull the lower end and thermostat and give a few shots of compressed air through the different nipples and tubes before reassembling the lower end with a new impeller.

I'm down here in Florida where the water temps don't dip below 60. If the thermostat is bad do I really need to replace it on this motor?

Thanks for the help,
Matt
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Old 01-17-2012
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Do the wp kit, not just the impeller. Same labor, slight cost increase. Yes, you need a stat or the plugs will foul.
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Old 01-17-2012
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Since you're set on removing the lower end, instead of a possible simple fix, you may find this helpful.
PDQ Forum • View topic - T9.9 lower end removal questions

Google "mud daubers in outboards pee hole"

Last edited by gershel; 01-17-2012 at 03:02 PM.
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Old 01-19-2012
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Just an update for clarification...

After hauling the boat when the engine wouldnt pee I hooked it up to the hose at which time the flush water exited the pee hole. That told me before I broke it apart that the discharge wasnt clogged. I opened the top cowling and removed the thermostat cover only to find that my engine doesn't have a thermostat. The previous owner removed it. I poured water down the thermostat and it exited through the discharge and lower telling me that I most likel;y dont have a clog in those lines. I dropped the lower end but when I inspected the impeller it appeared intact. I replaced the impeller and ordered a new thermostat and thats where Im at now.
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